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Sulfoglucuronyl glycolipids bind laminin
P S Mohan1, D K Chou, F B Jungalwala
1Eunice Kennedy Shriver Center for Mental Retardation, Waltham, Massachusetts 02254.
Journal of Neurochemistry
|June 1, 1990
Summary
The study reveals that specific sulfated glycolipids, 3-sulfoglucuronylneolactotetraosylceramide (SGGL-1) and 3-sulfoglucuronylneolactohexaosylceramide (SGGL-2), bind to laminin via their sulfate groups. This interaction is crucial for neural development signaling.
Area of Science:
- Neuroscience
- Glycobiology
- Developmental Biology
Background:
- HNK-1 antibody reactive glycoconjugates, including SGGL-1 and SGGL-2, are key developmental antigens in the mammalian cortex.
- Laminin, an extracellular matrix glycoprotein, mediates cell adhesion and neurite outgrowth, and is known to bind sulfatide.
Purpose of the Study:
- To investigate the interaction between sulfated glycolipids SGGL-1 and SGGL-2 with laminin.
- To elucidate the molecular basis of this interaction and its potential role in neural development.
Main Methods:
- Solid-phase radioimmunoassay and HPTLC-immunoblotting were used to study laminin binding to SGGLs.
- Laminin binding was detected using anti-laminin antibodies and radiolabeled Protein A.
- Chemical modifications (desulfation, esterification, reduction) were performed to identify essential moieties for binding.
Main Results:
- Laminin specifically binds to SGGL-1 and SGGL-2, as well as sulfatide, but not to gangliosides or neutral glycolipids.
- The sulfate group on SGGLs and sulfatide is essential for laminin binding; modifications to the glucuronic acid moiety had no effect.
- Heparin inhibited laminin binding to SGGLs and sulfatide, suggesting binding to the heparin-binding site of laminin.
Conclusions:
- The sulfate group is critical for the binding of SGGLs and sulfatide to laminin.
- SGGLs and sulfatide likely bind to the heparin-binding site of laminin.
- These interactions may function as important physiological signals during neural development.